Like any kid in the late 70s, I was obsessed with the droids in Star Wars. One of my favorites was a barely-seen background character, the Gonk Droid.
My Gonk is about half size. The ones in the film were little more than storage bins with various parts attached to add character. Mine takes a similar approach. One trip to my favorite store, American Science and Surplus, provided enough plausible droid bits to build out the components of my Gonk. Internal electronics give him enough pulsating lights to come to life.